According to a certain system, eight number emerges in sequence. A number is unknown. Can you find out what it should be?
Each number is the sum of classes of its predecessor numerals.
42 = 16 → 12 + 62 = 37 → 32 + 72 = 58 → 52 + 82 = 89 → 82 + 92 = 145 → 12 + 42 + 52 = 42 → 42 + 22 = 20 → 22 + 02 = 4
The missing number is 20.
We’d love to hear from you! email us Games@sciam.com To share your experience.
This puzzle is originally seen Spectrum dera visuschaft And was reproduced with permission.
